Extraction of copper • The copper ore is known as Chalcopyrite (CuFeS2). Copper is less than 2%, which is concentrated by froth floatation. • Roasting of chalcopyrite is done to remove iron sulphide in the form of FeO. 2CuFeS2(s) + O2(g) = Cu2S + 2FeS +SO2(g) FeS+1.5.O2(g) = FeO(s) + SO2(g) • Roasted ore is charged into a reverberatory furnce/flash smelting unit along with Silica (SiO2) as a flux. • Output of the furnace is matte (Cu rich liquid melt) along with FeO.SiO2 slag. Matte and slag are easily seperable.
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